Yeah, I took a look at one of the suites and they definitely are luxurious, but I think they divided up the room into far too many small areas - they use thick wooden blocks for shelves and partitions and I think they just take up to much space. It's the same in the lounge.
I don't know if the pricing is the same at all Hyatt's when it comes to club rooms, but at the Seoul GH it's an extra W50,000 ($50) for club room, which I think is really good for what you get. But I'd happily pay more if alcohol/soft drinks and small selection of snacks were always available and the lounge was 24/7 (or at least close to it). I've only stayed in club at the Langham Hotels (HK and Lon) and there the lounge was open 24/7 with beverages and snacks constantly available.
in the GH Seoul there's a mad rush from 17:30-19:30 to cram as many canapes and wine down your throat. In fact by the amount of food some guests had at their tables it looked like this was going to be their evening meal. The staff were rushing out the food like they were catering an all-you-can-eat contest, sadly though they weren't replenishing the beer and wine as often (note to avoid the champagne they have on offer, it tastes like someone introduced a bottle of chenin to a soda stream machine). And after 19:30 when everyone has had their fill and left, the place looked like a food fight had just finished, but the staff were doing their best to get it back to looking it's best.